//抽象出来的电脑类
public abstract class Computer {
    //组合，品牌
    protected Brand brand;//使用protected使让子类可以直接使用

    public Computer(Brand brand) {
        this.brand = brand;
    }

    public void info(){
        brand.info();//自带品牌
    }
}

class Desktop extends Computer{
    public Desktop(Brand brand) {
        super(brand);
    }

    @Override
    public void info() {
        super.info();
        System.out.println("台式机");
    }
}

class Laptop extends Computer{
    public Laptop(Brand brand) {
        super(brand);
    }

    @Override
    public void info() {
        super.info();
        System.out.println("笔记本");
    }
}
